Pentagonal tetrahedral block



FIG. 1 is a perspective view of a pentagonal tetrahedral block, showing a first embodiment of our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a back elevation view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a right side elevation view thereof;

FIG. 8 is a perspective view of a second embodiment of the pentagonal tetrahedral block, showing our new design;

FIG. 9 is a top plan view thereof;

FIG. 10 is a bottom plan view thereof

FIG. 11 is a front elevation view thereof;

FIG. 12 is a back elevation view thereof;

FIG. 13 is a left side elevation view thereof;

FIG. 14 is a right side elevation view thereof;

FIG. 15 is another perspective view of the first embodiment of the pentagonal tetrahedral block shown in FIGS. 1-7;

FIG. 16 is another perspective view thereof;

FIG. 17 is another perspective view thereof;

FIG. 18 is another perspective view of the second embodiment of the pentagonal tetrahedral block shown in FIGS. 8-12;

FIG. 19 is another perspective view thereof;

FIG. 20 is another perspective view thereof; and,

FIG. 21 is another perspective view thereof. 

CLAIM The ornamental design for a pentagonal tetrahedral block, as shown and described. 